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South Yarmouth Weather in September
September in South Yarmouth averages 23°C (73°F) during the day and 14°C (57°F) at night. Quite a bit of rainfall is typical this month, with around 96 mm (3.8 in) on average. An umbrella is a good idea.
Rainfall in South Yarmouth in September
Expect around 8 days of rain based on historical data, with 96 mm (3.8 in) average. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in South Yarmouth in September
The temperature in South Yarmouth in September is excellent. Daytime highs reach 23°C (73°F), with nights dropping to 14°C (57°F). September is a notable month of the summer season. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 14°C (57°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in South Yarmouth in September
Expect a lot of sunshine this month, with about 231 hours of sun. These sunny conditions add to the overall experience.So this is a great month to visit if you prefer dry days with pleasant temperatures.
South Yarmouth Temperature in September
Min Temperature
14°C (57°F)
Max Temperature
23°C (73°F)
Chance of Rain
27%
Precipitation
96 mm (3.8 in)
Rainy days
8 days
Sunshine
231 hours *
Percentage Sunshine
*
* Data from: Nantucket, the United States of America (43 KM, 26 Miles).
South Yarmouth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in South Yarmouth - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in South Yarmouth in September
For South Yarmouth in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in South Yarmouth in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
South Yarmouth 3-Day Forecast
More climate data for South Yarmouth
See the full South Yarmouth climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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